Innovative compact hybrid storage systems for low energy buildings
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The workshop Renewable Heating and Cooling Solutions for Buildings and Industry at Sustainable Places 2020 brought together a selection of H2020 EU-funded projects involving experts from the biomass, geothermal, solar thermal, and heat pump sectors to discuss a common strategy for increasing the use of renewable energy technologies for heating and cooling for buildings and industry.
Our partner AIT – the Austrian Institute of Technology – contributed to a national workshop on Thursday, 26th of November 2020, at the ENOVA-conference.
The aim of the workshop was to identify and rank market barriers for “comfort climate boxes” (integrated heat pump solutions) with national stakeholders. This work is part of the IEA HPT Annex 55, where HYBUILD was already presented back in June this year.
The HYBUILD Continental System was presented as part of the contribution to this event.
A new journal paper presenting HYBUILD results has been released in the Energies journal.
The area-proportional baseline method generates phase fraction–temperature curves from heat capacity data of phase change materials. The curves describe the continuous conversion from solid to liquid over an extended temperature range. They are consistent with the apparent heat capacity and enthalpy modeling approach for the numerical solution of heat transfer problems. However, the curves are non-smooth, discrete signals. They are affected by noise in the heat capacity data and should not be used as input to continuous simulation models. This contribution proposes an alternative method based on spline approximation for the generation of consistent and smooth phase fraction–temperature, apparent heat capacity–temperature and enthalpy–temperature curves. Applications are presented for two commercial paraffins from Rubitherm GmbH considering heat capacity data from Differential Scanning Calorimetry and 3-layer-calorimetry. Apparent heat capacity models are validated for melting experiments using a compact heat exchanger. The best fitting models and the most efficient numerical solutions are obtained for heat capacity data from 3-layer-calorimetry using the proposed spline approximation method. Because of these promising results, the method is applied to melting data of all 44 Rubitherm paraffins. The computer code of the corresponding phase transition models is provided in the Supplementary Information.
The conservation and rehabilitation of buildings of vernacular architecture is a sustainable approach, not only because it leaves a small ecological footprint, compared to the erection of new buildings, but also due to the passive bioclimatic design features integrated in vernacular buildings. This paper will investigate the thermal performance of vernacular architecture in lowland area in diverse climatic contexts.
The findings of the current research are based on an on-site investigation carried out in a representative vernacular building that is going to be upgraded to a hands-on technology exhibition area of renewable energy systems complimented with visual means to enhance the experience of visitors under a Research European Programme (Horizon 2020). The current study provides a basis for the formulation of a site-specific design strategy to improve thermal conditions and achieve energy conservation within lowland constructions in diverse climatic conditions. Understanding and analysing the thermal behaviour of these spaces is the first step towards this strategy. The quantitative analysis reveals the various challenges faced and opportunities provided by lowland structures and contributes to informing current design policies. Moreover, the analysis will inform the sizing of the technical systems throughout the year.
Work is ongoing at the Langenwang Austrian pilot, to prepare the installation of the HYBUILD hybrid storage system.
The continental climate system will be installed at this pilot site. The maximum heating power consumption expected after the foreseen retrofitting operations is 10 kW. The following technologies will be applied in the building: PV, PCM thermal latent storage, Heat pump.